HomeMy WebLinkAboutSewer System ReportSewer System Report
for
Castlegate II Subdivision
College Station, Texas
Prepared by Phillips Engineering
Original Report - Section 200 - February 2011
Section 201 - December 2011
Section 202 - June 2012
Prepared by Schultz Engineering
Section 100 —November 2012
Section 101—April 2013
Section 102 — July 2013
Section 203 — August 2013
Section 103 — August 2013
Section 204 — August 2013
Prepared By:
SCHULTZ ENGINEERING, LLC,
TBPE Firm Registration No. 12327
2730 Longmire, Suite A
College Station, Texas 77845
979.764.3900
Z3,/ 3
SGHULM ENGINEERING [LC
GENERAL INFORMATION
The Castlegate II Subdivision is a 202-acre residential subdivision being developed immediately
southwest of the existing Castlegate Subdivision in College Station. The approved Preliminary Plat
shows a total of 645 lots in the whole development. Sections 200, 201, 202, 203, 100, 101 and 103
have been completed or are under construction. Section 204 is unchanged from the Preliminary
Plat and will add 41 new lots.
The tract of land that comprises this subdivision lies across a drainage divide that cannot be crossed
using gravity lines. As a result, a lift station is being planned in a later phase of the development.
The force main from this development will empty into one of the trunk lines that serve much of the
rest of the development. On the spreadsheet shown in Exhibit B, the force main is shown as a 12"
gravity line for computational purposes.
Desinn Criteria:
Primary Sewer Outfalk Section 204 - 8" sewer line at Hadleigh Lane constructed with Section 200. Due to
conflicts with the proposed storm sewer, the 6" stub will be removed and an 8" line
constructed at a flatter slope.
Domestic Demand:
Avg. Pop Density: 2.67 people per lot
Average Flow: 100 gpd/cap or 267 gpd per lot
Peaking Factor: 4
Pipe: PVC D3034 SDR 26
Applicable Exhibits: Exhibit A — Overall Sewer System Layout
Exhibit B — Section 204 Sewer System Layout
Exhibit C — Sanitary Sewer Analysis Spreadsheet
Conclusion:
The sewer system shown in Exhibit A has been laid out using the criteria in the Bryan/College
Station Design Guidelines and TCEQ. It is analyzed assuming peak flow conditions when the
subdivision is fully developed. The spreadsheet in Exhibit C shows all lines depicted in Exhibit B
to be capable of carrying the flows that come to them under these conditions. This analysis will be
used as the basis for all subsequent sewer line designs in the subdivision. The system will
function as intended as long as the line sizes and slopes are equal to or greater than those shown
herein. It should be noted that any significant additional flow from off -site sources will likely
exceed the capacity of several lines, so careful study is advised of any changes to the contributing
area.
EXHIBIT A
OVERALL SEWER SYSTEM LAYOUT
EXHIBIT B
SECTION 204 SEWER SYSTEM LAYOUT
EXHIBIT C
SANITARY SEWER ANALYSIS SPREADSHEET
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